Jack-screw.



. PATENfgEDMAR. 5, 1907. `W. PBRRIS aus. R. W. BAGBR. JACK SGREW.

APPLIUTION FILED MAR. 26, 1906.

rrnrrnn srarns 'earner ernten.

WALTER FERRIS AND SVANTE ROBERT WAUKEE, WISCONSIN, ASSICN ORS MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

, SOUTH WILLIAM BAGER, OF SOUTI-I MIL- TO THE BUCYRUS COMPANY, OF

JACK-SCREW..

Specification of Letters Patent.

Patented March 5, 1907.

Application filed March 26,1906. Serial NoL 308,126.

T all wwnt it ntag/ concern:

Be it known that w e, WALTER FERRIs and SVANTE ROBERT WILLIAM Baena, both citizens of the 'United States, and both residing at South Milw aukee, county of Milwaukee, State of l/Yisconsin, have invented certy ain new and useful Improvements in Jack-Screws;

l l l and w e do hereby declare the follow to be l a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain neW and useful improvements in ack-screws, and has x 5 for its object to provide a simple and etlicient device of this character that will avoid the prevalent dii'lculty of upsettingr at the bearing end under heavy pressure, that will permit the screw-shank to be readily removed from this bearing, and that will enable the bearing-plate to be secured to the shank and carried therebyw hen the screw is being transported from place to place.

To these ends the invention comprises a threaded shank that is conveniently provided with a reduced neck to receive a handpiece or wheel removably supported thereon, an enlarged foot or bearing at the opposite end, a yoke provided w ith oppositelydisposed hooks or links and loosely supported on the shank above vthe foot or bearing, and a bearing-plate cooperating w ith the enlarged foot or bearing and provided with lateral projections which are adapted to be engaged by the yoke hooks or links w hen Vthe bearing-plate is to be temporarily secured to the shank.

In the accompanying' drawings, Ifligure l represents in side elevation a convenient form of jack-screw, the bearing-plate being shown in cross-section. I ig. 2 is a plan viewT of the bearing-plate. F ig. 8 is a vertical cross-section thereof. F ig. 4 is a plan vievv of the yoke. Iig. 5 is a vertical section thereof. I ig. 6 is a side elevation of the yoke. I ig. 7 is a fragmentary elevation of the low er end of a jack-screw, show ing a modified from of lifting-yoke.

Referring to the drawings, a indicates the shank, which is provided with screw-threads substantially throughout its length, which l l l r l l arm employed in connection with a railwaycar. Ine upper end of the shank a is prefer- 55 ably reduced, as at to receive a hand-w heel c or other handpiece, which may be removably secured to the shank by means of a pin d or other suitable fastening means.

According to former practice jack-screw 6o shanks have been provided with a screW thread or threads which run out to a small nose or reduced low er end, which permits the shank to be withdrawn from its supportingsocket; but it has been found that this small nose rapidly upsets and enlarges under the heavy pressure imposed upon the shank and not infrequently becomes so large as to prevent the jack-.screw being w ithdrawn through the socket. The present invention obviates 7o this dil'liculty by so constructing the upper portion of the shank a that upon removing the handpiece c the screw-shank may be withdrawn through the supporting-socket in the reverse directionkthat is to say, by turn- 7 5 ing the shank forward through the nut instead of backing it out.

In order to avoid the tendency of the end of the shank to upset, it is provided with an enlarged foot or bearing e, which may be con- 8o veniently given a generally round form and which is of considerably larger diameter than the shank.

It is customary to provide devices of this characterwith a bearing plate or shoe which 8 5 is interposed between tne foot of the shank and the ground or other support. For obvious reasons itis desirable that this bearing plate or shoe he formed as a separate element capable of being removed When the 9o jack-screw is not in use. It is also apparent that it is often convenient to retain the bearing plate or shoe in proper cooperative relation with the shank when the jack-screw is being moved from place to place.

According to former practice it has been customary to make the bearing-plate separate from the shank and to support the same by temporarily attaching it, by means of ropes or chains, to some part of the structure roo when the latter is to be moved. Such an expedient, however, is generally unsatisfactory and wasteful of time and labor, for the are adapted to engage corresponding screwreason that the attachment and detachment threads in the socket ofthe support, which in the form of the invention illustrated is a jackof the hearing-plate must he carefully at tended to by the workmen.

According to the present invention it is proposed to provide means for automatically picking up the bearing-plate when the jack-screw is retracted and .for automatically releasing the bearing-plate when the jackscrew is brought into position for active operation. 'lhe automatic engagement and disengagement of the shank and bearingplate may be effected by any suitable means, and a convenient arrangement for accomplishing this purpose comprises a collar or yoke loosely mounted on the shank and provided with depending links or hooks adapted to engage suitable projections, bails, or the like on the plate.

A convenient form of this mechanism is illustrated in Figs. 1, 4, 5, ando of the drawings and comprises a collar or yoke f, the central opening of which permits the yoke to be freely moved up and down the shank a and to normally rest upon the upper surface of the enlarged foot or bearing e on the end of the shank. Projecting laterally from opposite sides of the yoke f are two hooks g, which are oppositely disposed with respect to each other. These hooks g, it will be noted, depend from the sides of the yoke and lie en opposite sides of the shank a, so that when the said shank is retracted by the ordinary operation of unscrewing the hooks, which are carried around by frictional engagement between the yoke and the shank, pass under two oppositely-disposed projections on' the bearing-plate h, which projections may conveniently be formed as bails or handles lc. It will be noted that when the shank is rotated in the opposite directionl namely, to advance the said shank-the yoke f and the hooks g are rotated in an opposite direction, thereby disengaging vthe hooks g from the bails k and releasing thebearingplate h from the shank a. It will be apparent also that the bearing plate or shoe h may be manually released at any time by merely turning the yoke on the shank to dis engage the hooks from the bails. The said bearing-plate h consists of a generally rectangular base i, provided with a boss or protuberance j on its upper face, having therein a socket l, provided with a generally rounded bottom to engage the corresponding surface on the end of the foot or bearing f of the shank a. The bails or handles k may be oonveniently formed as an integral part of the bearing-plate h, extending from diametri@- ally opposite points near the top of the boss j to the base i. These bails k also afford convenient means for lifting and transporting the bearing-plates by hand or in any other desired manner.

It will be noted that the invention, as hereinbefore described, affords an` exceedingly simple and efficient device for the purpose specified and admits of ready adaptation under the varying conditions of operation.

For example, when it is desired to remove the bearing-plate it is released by merely turning the yoke f to disengage the hooks g from' the bails 7c. On the other hand, when it is desired to lift the bearing-platefwhen the apparatus is moved from place to place the mere act of retracting the shank of the jackscrew from its engagement with its ground support automatically causes the hooks on yoke f to engage the bails on the bearingplate and support saidplate from the shank. Furthermore, when it is desired to remove the shank from its bearing socket or supporti, it is only necessary to lift the handle from its engagement with the upper end of the shank and turn the latter forward until its threads pass out of engagement with the socket.

it will be apparent that the lifting-yoke and thesmode of engaging the same with the bearing-plate may be varied Within wide limits without departing from the spirit of the invention. One simple and convenient modification of the lifting-yoke and its connecting means is illustrated in Fig. 7, in which the yoke j" is provided with two lateral ears, in which are pivoted pendent links g g', the eyes of which are adapted to engage pins g g, projecting from the opposite sides of the bearing-plate. The links being pivoted to the body of the yoke f may of course beA swung into and out of engagement with the pins g at will, and it will be understood that the holes or eyes in the links are made sufficiently large to pass freely into and out of engagement with said pins. Furthermore, it will be noted that the disposition of the links and pins may be reversed-to wit, the links may be located on the plate and the pins on the yoke-and a similar disposition may be effected with respect to the hooks and cooperating engaging means illustrated in Fig. 1, all of which modifications are regarded as falling within the scope of our present invention.

1. A jack-screw, comprising a threaded shank, a reduced neck, a handpiece removably mounted on said neck, and an enlarged foot or bearing on the end opposite the handpiece.

2. A jack-screw, comprising a threaded shank, lan enlarged foot or bearing on the end thereof, a bearing-plate cooperating with said foot or bearing, and cooperating means on the shank and late to removably secure said plate to the sffank. A

3. A jack-screw, comprising a threaded shank, a yoke having oppositely-disposed hooks thereon loosely mounted on said shank, and a bearing-plate having projections thereon to engage the yokehooks and support the plate from the shank when the latter is retracted.

4. A jack-screw, comprising a threaded shank, a yoke loosely mounted on said shank' lOO IIO

ISO

and having engaging members thereon, and a bearing-plate having eoperating members thereon to engage the yoke members and support the plate from the shank when the latter is lifted.

5. A jack-screw, comprising a threaded shank, a yoke having oppositely-disposed hooks thereon loosely mounted on said shank, and a bearing-plate having lateral bails or handles to engage the hooks and support the plate from the shank When the latter is retracted.

6. A jack-screw, comprising a threaded shank, an enlarged foot or bearing at one end thereof, a yoke loosely surrounding the shank l above said foot and having oppositely-projecting hooks thereon, and a bearing-plate cooperating with said foot or bearing, said plate having lateral bails or handles to engage the hooks and support the plate from zo the shank when the latter is retracted.

7. A jack-screw, comprising a threaded ank, a handpieee removably secured to above the foot or base, a soeketed bearingplate cooperating with said foot or bearing, and lateral bails or handles on said plate cooperating With the said hooks to support the 3o plate.

In testimony whereof We affix our signatures in presence of two Witnesses.

WALTER FERRIS.

SVANTE ROBERT Witnesses:

HARRY B. HAYDEN,

RIDGELY FLETCHER.

WILLIAM BAGER. 

